package com.swpu.demo.utils;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTCreator;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.util.Calendar;
import java.util.Map;

public class JWTUtil {
    //自定义解密秘钥
    private static final String SING="!Q@W#E$R%T^Y";
    //生成token  header.payload.sing
    //传递的参数可以是User类等
    public static String getToken(Map<String,String> map){
        Calendar instance=Calendar.getInstance();
        instance.add(Calendar.HOUR,12);//12个小时过期
        JWTCreator.Builder builder=JWT.create();
        //payload
        map.forEach((k,v)->{
            builder.withClaim(k, v);
        });
        String token = builder.withExpiresAt(instance.getTime())
                .sign(Algorithm.HMAC256(SING));
        return token;
    }

    //验证token合法性
    public static DecodedJWT verify(String token){
        return JWT.require(Algorithm.HMAC256(SING)).build().verify(token);
    }
}
